Line insulator



Se t. 18', 1923. 1,468,044

L. STEINBERGER LINE INSULATOR Filed March 11, 1919 IN VE IV TOR Lao/s 57 6/ beryer Patented Sept. 18, 1923.

UNITED STATES LOUIS srmmmaena, or BROOKLYN, NEW Yoak.

LINE INSULATOB.

Application filed March 11, 1919. Serial No. 281,943.

2 To all whom. itmay comer-n! Be it known that I, LOUIS STEINBERGER, a citizen of the United States, and a resident of the borough of Brooklyn,.city and State of New York, have invented certain new and useful Improvements in Line I nsulators, of which the following is a specification.

The invention relates to line insulators of the pin type, so constructed as to provide means for redistributing the electrical stresses which may be and usually are set up within the body of the insulator between the line and the ground, and also so con-. structed that a cavity will be formed in the interior of the body of the insulator when mounted upon the supporting pin which cavity will have free communication with the atmosphere in order to properly ventilate the interior and cool the same.

One of the objects of the invention therefore is to so construct a line insulator of the pin type that means will be provided for redistributing the electrical stresses.

Another object of the invention is to provide an air chamber within the body of the insulator with free air passages from the chamber to the atmosphere when the insulavtor is mounted upon the supporting pinand is ready for use.

Another object of the invention is to provide a metal thimble or lining for the interior-air chamber of such a form and con struction that the lining will be properly anchored therein and prevented from turning with respect to the insulator body when the insulator embodying my invention is mounted upon the supporting pin.

Other objects will appear from the following specification and claims.

In the drawings! Fig. 1 is a sectional view of a line insulater of the pin type embodying my invention, the supporting pin being shown in elevation. i

Fig. 2is a section on line 22 of Fig. 1.

Fig. 3 is a view in' perspective of the lower portion of the metal thimble or lining, said thimble or linin being broken away.

Fig. 4 is a p an view taken in direction of the arrows of the lower end of the metalthimble taken along the line 4-4 with the but it may be made as stated of other in sulating material, such as porcelain or the like. When the body is made of insulating material which is moldable, such as electrose the thimble forming a lining within the chamber in the central portion of the body is molded to the body of insulating material during its manufacture in a manner well understood in the art. When the body is made of porcelain or similar ma terial, the metal thimble or lining of the interior chamber is secured Within the body by cement which is also a means to this end well known in the art.

Referring to the drawings, 10 represents a body of insulating material in substantially the form shown, provided with series of hoods or petticoats 11, 12, and 13, which extend circumferentially and radially from the main portion of the insulating body. These petticoats are for the purpose well known in the art of providing rain sheds and also to prevent an arc-over when the insulator is in use.

In the upper portion of the insulator body is provided a groove or seat 14 for the line wire L, and the groove 16 for the tie wire (not shown). The-skirts or hoods 11, 12 and 13, on the insulator body, may be destroyed either by gum shots or by strokes'of lightning, and yet notwithstanding these mutilations or destructions the insulator would still be in good condition for use. In other words, the destruction. of the skirt or hood portions would not affect the capability of the insulator of performing its function with the sole exception that its capability to prevent an are over would be slightly reduced. g

The chamber C is provided within the 'body of the insulator and'this chamber is provided with a metal lining or thimble 20-which is constructed as follows: The lining or thimble 20 has a rounded head at 21 and is provided on its lower portion with a longitudinally extending rib or ribs 22, the said rib or ribs having grooves 23 on their inner side. Screw-threads 24.- are provided on the inner surface of the metal thimble adjacent the grooves, as shown, for the purpose of engaging with the screwthreads 25 of the projecting end 26 of the supportin pin P.

When tie insulator is mounted upon the pin, the upper portion of the pin is situateda short distance below the upper ends of the grooves 23, the grooves 23 extending downwardly along the inner surface of the ribs and then extending outwardly and radially at 27 on the under-surface of the radial flange 28 of the thimble 20.

The rounded head of the hollow thimble which is embedded in the body of the insulator is productive of several results. time is as stated above, the redistribution of the electrical stresses, and the second is for the purpose of forming an air chamber within the body of the insulator. The outwardly extending rib or ribs on the side of the thimble at its lower portion are for the purpose of anchoring the thimble within the insulator so as to prevent the same from turning when the pin is secured rigidly into the insulator. The object of the grooves 23 and 27 is for the purpose of providing means for the admission of cold air and the escape of the heated air from the chamber 0, which heated air may have been developed by the power of the current within the upper portion of the thimble.

It thus clearly appears from the above that the insulator is practicably indestructible and is provided with a puncture-proof body portion. The insulator is self-cooling and means are provided therein for causing the redistribution of the electrical stresses within the body of the'insulator. At the same time the aforesaid means is properly anchored within the insulator and is prevented from turning when the insulator body is mounted upon the screw-threads of the pin.

As changes of construction could be made within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrat1ve and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. An insulator provided with an interior chamber and a substantially cylindrical conduit leading outwardly therefrom the wall of said conduit having a groove therein extending into the said chamber, said groove communicating with another groove extending at an angle thereto and formed on the outside of the insulator.

2. An insulator provided with an interior chamber and a substantially cylindrical conduit leading outwardly therefrom the wall of said conduit having a plurality of grooves therein extending therealong and into the said chamber, each of said grooves communieating respectively with another groove extending at an angle thereto and formed on the outside of the insulator.

3. An insulator having an interior chamber formed therein, and a conduit leading therefrom to the surface of the insulator, a

lining for said interior chamber and conduit, said lining being provided with a plurality of grooves extending longitudinally along the wall of the conduit, said grooves each communicating with other grooves situated at an angle thereto and extending along the surface of th insulator.

4. An insulator comprising an insulating body and lining therefor said insulator having an interior chamber formed therein, and having a conduit leading from said chamber to the surface of the insulator, a lining for said interior chamber and conduit, said lining being provided with ribs to prevent relative movement between it and the insulator body, the said ribs also having grooves formed therein, said grooves communicating with the chamber, and with grooves extending at an angle therefrom and leading along the surface of the insulator.

5. An insulator having an interior cha1nber formed therein, and a conduit leading therefrom to the surface of the insulator, a

flanged lining for said interior chamber, the

flange forming a support for the insulator, said lining and flange being provided with connecting grooves, situated at an angle to each other and leading from the interior chamber along the surface of the insulator.

6. An insulator having a hollow metallic thimble secured thereto said thimble forming a chamber therein and shaped to preventa relative movement therewith, a screwthreaded support for said insulator, said thimble being provided with screw-threads arranged to co-act with said threaded support, the threads of said thimble being interrupted to form longitudinal passages to permit of communication between the interior chamber of said thimble and the atmosphere;

7. An insulator having a hollow metallic thimble secured thereto and forming a chamber therein and shaped to prevent a relative movement therewith, a screw-threaded support for said insulator, said thimble being provided with screw-threads and a protecting flange and arranged to co-act with said threaded support, the threads of said thimble being interrupted and the said flange being grooved to form at least one passage to permit of communication between the interior chamber of said thimble and the atmosphere.

8. An insulator having a hollow metallic thimble secured thereto and forming a chamber therein, said thimble being provided with an expanded upper portion and with vertically disposed corrugations on its lower portion, also with transversely disposed screw threads on the inner wall of the lower portion between the said corrugations, said thimble being provided with a protecting flange, the said screw threads and protecting flange being arranged to co-act with a threaded support, said flange being grooved to form at least one passageway from the chamber to the surrounding atmosphere to permit of communication between the interior chamber of said thimble and the atmosphere.

9. An insulator having a hollow metallic thilnble secured thereto and forming a chamber therein, said thimble being provided with an expanded upper portion and longitudinal ribs on its lower portion, said thimble being provided with screw threads and a protecting flange, the inside of said ribs being provided with grooves to form passageways to permit of communication between the interior chamber of said thimble 1 and the atmosphere when said insulator is mounted upon a supporting pin.

In witness whereof I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 10th day of 20 

